Paystack is a Splynx add-on. It allows to pay invoices via payment gateway - https://paystack.com/.
Add-on can work with different credit cards and bank accounts, if cards or bank accounts are saved, then addon allows to charge all customers using Direct debit order.
To install Paystack add-on use following commands:
apt-get update apt-get install splynx-paystack
or you can install it from Web UI:
config -> Integrations -> Add-ons:
After installation you have to configure params in config -> Integrations -> Modules list. And here you can set a fee parameters. Look at the screenshot:
Public and secret keys can be taken from Paystack account:
Now customers can pay their invoices using Paystack system in Finance / Invoices:
If everything went well, you will see status of invoice as "Paid" (portal and admin):
Besides that, you can charge all customers, using one button! Go to Finance → Invoices, set the period and click "Charge" as on a screenshot: